A deoxidizing device and a deoxidizing method for an LF ladle refining furnace

Abstract

The present application provides a kind of deoxidizing device and deoxidizing method for LF ladle refining furnace, the LF ladle refining furnace includes water-cooled cover and ladle, the deoxidizing device includes lance and injection tank, the lance and the injection tank are communicated, the injection tank is loaded with deoxidizing material, the lance is installed on water-cooled cover, and the lance can spray the deoxidizing material in the injection tank into the surface of molten steel in the ladle.The deoxidizing device is designed by multiple lance tilting, which makes the deoxidizing material evenly spread on a larger slag surface, and speeds up the reaction speed of slag surface. The furnace door does not need to be opened throughout the process, effectively maintaining the reducing atmosphere in the furnace, avoiding steel slag splashing and smoke dispersion, greatly improving the working environment, reducing the safety hazards caused by steel slag splashing, reducing the material loss sucked by axial flow fan, and reducing production cost. The deoxidizing device uses a control system to achieve precise dosing and continuous supply of deoxidizing material, reducing human factor interference and deoxidizing more thoroughly.

Description

Technical Field

[0001] This invention relates to the field of steel metallurgical refining equipment technology, and in particular to a deoxidation device and deoxidation method for an LF ladle refining furnace. Background Technology

[0002] Traditional LF furnace deoxidation involves manually or mechanically adding deoxidizing materials into the ladle through the furnace door. This method has the following drawbacks: (1) The deoxidation material is added in a concentrated manner, and the deoxidation material has a small spreading area in the LF ladle. The deoxidation material may be drawn into the molten steel, causing silicon back phenomenon, which is not conducive to the slag surface reaction rate and deoxidation degree of the deoxidation material. (2) During the process of adding deoxidizing materials, steel slag splashing is likely to occur, and the flue gas dispersion is serious, which is detrimental to work safety and the environment. (3) In order to reduce the degree of flue gas dispersion, an axial flow fan is usually installed at the furnace door. The deoxidizing material is usually in powder form. During the addition process, the deoxidizing material is easily carried away by the airflow of the axial flow fan, resulting in waste.

[0003] (4) Opening and closing the furnace door will disrupt the reducing atmosphere of the furnace cover and LF area, increasing the risk of secondary oxidation of molten steel. Summary of the Invention

[0004] The purpose of this invention is to provide a deoxidation device and method for an LF ladle refining furnace. The deoxidation device uses a spray gun installed on the water-cooled furnace cover of the LF refining furnace to spray deoxidizing material into the ladle of the LF refining furnace, which effectively maintains the reducing atmosphere inside the furnace, avoids slag splashing and flue gas dispersion, greatly improves the working environment, reduces the safety hazards caused by slag splashing, and reduces costs.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A deoxidation device for an LF ladle refining furnace, the LF ladle refining furnace including a water-cooled furnace cover and a ladle, the water-cooled furnace cover covering the top of the ladle, the deoxidation device including a spray gun and a spray can, the spray gun and the spray can being connected, the spray can containing deoxidizing material, the spray gun being mounted on the water-cooled furnace cover, the spray gun being able to spray the deoxidizing material in the spray can into the surface of the molten steel in the ladle.

[0006] Furthermore, in the aforementioned deoxidation device for the LF ladle refining furnace, the water-cooled furnace cover includes an upper cover and a lower cover. The upper cover is a spherical structure, and the lower cover is a cylindrical structure with openings at both ends. The upper cover covers the upper end of the lower cover, and the upper cover and the lower cover are an integral structure. A hole is provided on the upper cover, and the spray gun enters the water-cooled furnace cover through the hole.

[0007] Furthermore, in the above-mentioned deoxidation device for the LF ladle refining furnace, the upper cover is provided with three holes, and each hole is equipped with a spray gun; the distance L1 between the center point of the hole and the center point of the upper cover is 50mm~100mm; the three holes are evenly distributed along the circumference of the upper cover.

[0008] Furthermore, in the aforementioned deoxidation device for the LF ladle refining furnace, two permeable bricks are provided at the bottom of the ladle, and the projection of one of the three spray guns at the bottom of the ladle is located between the two permeable bricks.

[0009] Furthermore, in the above-mentioned deoxidation device for the LF ladle refining furnace, an electrode is provided at the center of the water-cooled furnace cover, the nozzle of the spray gun is inclined towards the electrode, and the angle α between the axis of the spray gun and the axis of the ladle is 40°~50°.

[0010] Furthermore, in the aforementioned deoxidation device for the LF ladle refining furnace, the length L2 of the spray gun entering the inner side of the water-cooled furnace cover from the water-cooled furnace cover is 150mm~300mm.

[0011] Furthermore, in the aforementioned deoxidation device for the LF ladle refining furnace, the injection tank consists of an upper straight cylindrical section and a lower inverted conical section. The upper end of the straight cylindrical section is the feed inlet, and the lower end of the inverted conical section is the discharge outlet. A valve is installed at the discharge outlet. A mixing box is installed below the injection tank, and the mixing box is connected to the injection tank through the valve. A gas source is connected to the valve through a first gas supply pipeline, and the gas source is also connected to the mixing box through a second gas supply pipeline. The mixing box is connected to the spray gun through an injection pipeline.

[0012] Furthermore, in the aforementioned deoxidation device for the LF ladle refining furnace, a weighing system is provided inside the injection tank, which weighs the deoxidizing material entering the injection gun.

[0013] Furthermore, in the aforementioned deoxidation device for an LF ladle refining furnace, the deoxidation device also includes a control system, and both the spray gun and the weighing system are connected to the control system.

[0014] On the other hand, a method for deoxidizing an LF ladle refining furnace using the aforementioned deoxidizing device is provided, comprising the following steps: Step 1, preparation stage: add deoxidizing material to the injection tank, and select the corresponding control mode in the control system according to the steel grade being smelted. Step 2: During the 10th to 15th minute of refining in the LF furnace, deoxidizer material is injected intermittently onto the slag surface inside the furnace through a spray gun. The injection frequency is once per minute. When smelting low-carbon steel, the injection amount per injection is 14.3~15.7 kg; when smelting medium-carbon steel, the injection amount per injection is 25.5~34.5 kg; and when smelting high-carbon steel, the injection amount per injection is 43.5~57.5 kg. Step 3: During the 25th to 30th minute of refining in the LF furnace, deoxidizing material is injected. The injection frequency of the spray gun is maintained at once per minute. When smelting low carbon steel, the injection amount per injection is 7.6~8.4Kg; when smelting medium carbon steel, the injection amount per injection is 12.8~17.2Kg; when smelting high carbon steel, the injection amount per injection is 17~23Kg. Step 4: During the 35-40 minute stage of refining in the LF furnace, deoxidizing material is injected. The injection frequency of the spray gun is maintained at once per minute. When smelting low carbon steel, the injection amount per injection is 1.9-2.1 kg; when smelting medium carbon steel, the injection amount per injection is 6.8-9.2 kg; when smelting high carbon steel, the injection amount per injection is 8.5-11.5 kg. Step 5: During the 40-minute or later stage of refining in the LF furnace, deoxidizing material is injected. The injection frequency of the spray gun is adjusted to once every three minutes. When smelting low carbon steel, the injection amount is 1.9~2.1Kg each time; when smelting medium carbon steel, the injection amount is 6.8~9.2Kg each time; when smelting high carbon steel, the injection amount is 8.5~11.5Kg each time, until refining is completed.

[0015] Analysis reveals that this invention discloses a deoxidation device and method for an LF ladle refining furnace. This deoxidation device, through a multi-sprayer inclined design, ensures the deoxidizing material is evenly spread across a larger slag surface, accelerating the slag surface reaction rate. The entire process does not require opening the furnace door, effectively maintaining a reducing atmosphere within the furnace, avoiding slag splashing and flue gas dispersion, significantly improving the working environment, reducing safety hazards caused by slag splashing, minimizing material loss due to axial flow fans, and lowering production costs. The deoxidation device utilizes a control system to achieve precise quantitative and continuous supply of deoxidizing material, reducing human interference and resulting in more thorough deoxidation. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. Wherein: Figure 1 This is a schematic diagram of a structure according to an embodiment of the present invention.

[0017] Figure 2 This is a top view of an embodiment of the present invention.

[0018] Figure 3 This is a top view of a steel ladle structure according to an embodiment of the present invention.

[0019] Figure 4 This is a schematic diagram of the structure of a spray can according to an embodiment of the present invention.

[0020] Explanation of reference numerals in the attached drawings: 1. Spray gun; 2. Water-cooled furnace cover; 3. Electrode; 4. Permeable brick; 5. Hole; 6. Steel ladle; 7. Upper cover; 8. Lower cover; 9. Spraying tank; 10. Feed inlet; 11. Straight section; 12. Inverted conical section; 13. Valve; 14. Mixing box; 15. First gas supply line; 16. Second gas supply line; 17. Spraying line; 18. Gas source. Detailed Implementation

[0021] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. Various examples are provided by way of explanation and not by way of limitation. Indeed, those skilled in the art will recognize that modifications and variations can be made to the invention without departing from its scope or spirit. For example, a feature shown or described as part of one embodiment may be used in another embodiment to produce yet another embodiment. Therefore, it is desirable that the invention encompass such modifications and variations falling within the scope of the appended claims and their equivalents.

[0022] In the description of this invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and do not require the invention to be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on the invention. The terms "connected," "linked," and "set up" used in this invention should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a direct connection or an indirect connection through intermediate components; a wired connection, a radio connection, or a wireless communication signal connection. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0023] The accompanying drawings illustrate one or more examples of the invention. The detailed description uses numerals and letters to refer to features in the drawings. Similar or analogous reference numerals in the drawings and description have been used to refer to similar or analogous parts of the invention. As used herein, the terms “first,” “second,” and “third,” etc., are used interchangeably to distinguish one component from another and are not intended to indicate the location or importance of individual components.

[0024] like Figures 1 to 4As shown, according to an embodiment of the present invention, a deoxidation device for an LF ladle refining furnace is provided. The LF ladle refining furnace includes a water-cooled furnace cover 2 and a ladle 6, with the water-cooled furnace cover 2 covering the top of the ladle 6, as shown. Figure 1 As shown, the LF ladle refining furnace includes a spray gun 1 and a spray tank 9, which are connected. The spray tank 9 contains deoxidizing material. The spray gun 1 is mounted on the water-cooled furnace cover 2, and it sprays the deoxidizing material from the spray tank 9 onto the surface of the molten steel in the ladle 6. Using this deoxidation device for deoxidation operations in the LF ladle refining furnace eliminates the need for frequent furnace door opening, avoiding slag splashing and flue gas dispersion, improving the working environment, reducing safety hazards caused by slag splashing, and lowering costs.

[0025] Furthermore, the water-cooled furnace cover 2 includes an upper cover 7 and a lower cover 8. The upper cover 7 has a spherical structure, and the lower cover 8 has a cylindrical structure with openings at both ends. The upper cover 7 covers the upper end of the lower cover 8, and the upper cover 7 and the lower cover 8 are an integral structure. A hole 5 is provided on the upper cover 7 of the water-cooled furnace cover 2, and the spray gun 1 enters the water-cooled furnace cover 2 through the hole 5.

[0026] Furthermore, such as Figure 2 As shown, three holes 5 are provided on the upper cover 7, and a spray gun 1 is installed in each hole 5. The distance L1 between the center point of the hole 5 and the center point of the upper cover 7 is 50mm~100mm (e.g., 50mm, 60mm, 70mm, 80mm, 90mm, 100mm). The three holes 5 are evenly distributed around the circumference of the upper cover 7. By evenly setting three spray guns 1 on the upper cover 7 of the water-cooled furnace cover 2, the diffusion deoxidation area can be effectively increased, allowing the deoxidizing material to be sprayed more evenly on the surface of the molten steel in the ladle, thus improving the deoxidation effect on the slag surface. Since the upper cover 7 of the water-cooled furnace cover 2 is relatively high above the molten steel surface in the ladle, installing the spray guns 1 on the upper cover 7 of the water-cooled furnace cover 2 is beneficial to the spreading of the deoxidizing material. At the same time, it can reduce the probability of the spray guns 1 being damaged due to scratching other steelmaking equipment or foundation structures during the installation of the water-cooled furnace cover 2, thereby increasing their service life.

[0027] Furthermore, such as Figure 3As shown, two permeable bricks 4 are installed at the bottom of the ladle 6, and the projection of one of the three spray guns 1 at the bottom of the ladle 6 lies between the two permeable bricks 4. During the LF ladle refining process, argon gas is blown into the molten steel through the permeable bricks 4 at the bottom of the ladle 6, forming a large number of tiny bubbles. These bubbles rise and drive the molten steel to form a continuous circulation. The spray guns 1 are set at the top of the water-cooled furnace cover 2, and the permeable bricks 4 are located at the bottom of the ladle. In terms of projection relationship, the projection 7 of one spray gun at the bottom of the ladle lies between the two permeable bricks 4, and the three spray guns 1 are evenly distributed around the circumference of the water-cooled furnace cover 2. This allows the deoxidizing material sprayed by the spray guns 1 to accurately avoid the strong agitation zone formed by the bottom-blown argon gas, greatly reducing the probability of the molten steel flow entraining the deoxidizing material inside, and ultimately effectively reducing the occurrence of quality abnormalities such as silicon return in the molten steel.

[0028] Furthermore, an electrode 3 is positioned at the center of the water-cooled furnace cover 2. The angle α between the axis of the spray gun 1 and the axis of the ladle 6 is 40°~50° (e.g., 40°, 41°, 42°, 43°, 44°, 45°, 46°, 47°, 48°, 49°, 50°), and the nozzle of the spray gun 1 is tilted towards the electrode 3. The length L2 of the spray gun 1 entering the inner side of the water-cooled furnace cover 2 is 150mm~300mm (e.g., 150mm, 170mm, 190mm, 210mm, 230mm, 250mm, 270mm, 300mm). This arrangement ensures that the spray point of the spray gun 1 accurately lands at the midpoint between the center point of the liquid surface inside the ladle 6 and the inner wall of the ladle, which is the midpoint of the radius of the circle containing the liquid surface of the ladle, ensuring that the deoxidizing material can completely cover the surface of the molten steel. The use of three inclined spray guns 1 allows the deoxidizing material to be evenly spread over a larger slag surface, accelerating the reaction rate and resulting in more thorough deoxidation. Compared to placing the spray guns 1 in the lower cover 8, the distance between the upper cover 7 and the liquid surface is much greater than the distance between the lower covers 8, allowing the spray guns 1 in this invention to have a smaller inclination angle (the angle between the axis of the spray gun 1 and the axis of the ladle 6). This ensures that the liquid surface near the center of the ladle 6 and near the inner wall of the ladle 6 can be covered by the deoxidizing material, thereby guaranteeing the deoxidation effect.

[0029] In one embodiment of the present invention, the angle between the axis of the spray gun 1 and the axis of the ladle 6 is 45°.

[0030] Furthermore, such as Figure 4As shown, the spray tank 9 consists of an upper straight cylindrical section 11 and a lower inverted conical section 12. The upper end of the straight cylindrical section 11 is the inlet 10, which is used to fill the spray tank 9 with deoxidizing material. The lower end of the inverted conical section 12 is the outlet, and a valve 13 is provided at the outlet. A mixing box 14 is provided directly below the spray tank 9, and the mixing box 14 is connected to the spray tank 9 through the valve 13. The gas source 18 is connected to the valve 13 through the first gas supply pipeline 15. The gas from the gas source 18 enters the valve through the first gas supply pipeline 15. The carrier gas output from the gas source 18 comes into full contact with the deoxidizing material falling from the spray tank 9 inside the valve 13, forming a stable gas-solid two-phase mixed flow in advance. This avoids bridging and blockage of the deoxidizing material at the outlet, effectively ensuring the continuity of the deoxidizing material transportation process. The mixing chamber 14 is connected to the spray gun 1 via the spray pipe 17. The gas source 18 is also connected to the mixing chamber 14 via the second gas supply pipe 16. The gas from the gas source 18 enters the mixing chamber 14 via the second gas supply pipe 16. The carrier gas supplemented by the gas source 18 can perform secondary enhanced mixing of the formed gas-solid mixture in the mixing chamber 14. Finally, it is delivered to the spray gun 1 via the spray pipe 17, and the spray gun 1 sprays the deoxidizing material into the ladle 6.

[0031] Furthermore, a weighing system is installed inside the injection tank 9 to weigh the deoxidizing material entering the injection gun 1. The deoxidizing device also includes a control system, which is connected to both the injection gun 1 and the weighing system. The control system can select different control modes according to different steel grades. By controlling the injection frequency and injection volume of the injection gun 1, the control system can achieve precise quantitative and continuous supply of deoxidizing material.

[0032] The present invention also discloses a method for deoxidizing an LF ladle refining furnace using the above-mentioned deoxidation device for an LF ladle refining furnace, comprising the following steps (the time interval between the two stages is the power supply time, and the nominal volume of the ladle 6 is 70t): Step 1, preparation stage: add deoxidizing material to injection tank 9, and select the corresponding control mode in the control system according to the steel grade being smelted. Step 2: During the 10-15 minute stage of refining in the LF furnace, deoxidizer material is injected intermittently onto the slag surface inside the furnace through spray gun 1. The injection frequency is once per minute. When smelting low carbon steel (carbon content less than 0.25%), the injection amount per injection is 14.3-15.7 kg; when smelting medium carbon steel (carbon content between 0.25% and 0.60%), the injection amount per injection is 25.5-34.5 kg; when smelting high carbon steel (carbon content greater than 0.60%), the injection amount per injection is 43.5-57.5 kg. Step 3: During the 25th to 30th minute of refining in the LF furnace, deoxidizing material is injected. The injection frequency of spray gun 1 is maintained at once per minute. When smelting low carbon steel, the injection amount per injection is 7.6~8.4Kg; when smelting medium carbon steel, the injection amount per injection is 12.8~17.2Kg; when smelting high carbon steel, the injection amount per injection is 17~23Kg. Step 4: During the 35-40 minute stage of refining in the LF furnace, deoxidizing material is injected. The injection frequency of spray gun 1 is maintained at once per minute. When smelting low carbon steel, the injection amount per injection is 1.9-2.1 kg; when smelting medium carbon steel, the injection amount per injection is 6.8-9.2 kg; when smelting high carbon steel, the injection amount per injection is 8.5-11.5 kg. Step 5: During the 40-minute or later stage of refining in the LF furnace, deoxidizing material is sprayed. The spraying frequency of spray gun 1 is adjusted to once every three minutes. When smelting low carbon steel, the amount sprayed each time is 1.9~2.1Kg; when smelting medium carbon steel, the amount sprayed each time is 6.8~9.2Kg; when smelting high carbon steel, the amount sprayed each time is 8.5~11.5Kg, until refining is completed.

[0033] In practical applications, compared with the method of directly adding deoxidizing materials through the furnace door, using this device to spray deoxidizing materials into the ladle 6 can reduce the average oxygen content of bearing steel from about 4.74 ppm to about 4.62 ppm.

[0034] Example 1: In this embodiment, low-carbon steel of grade 20CrNiMo is subjected to LF refining furnace deoxidation.

[0035] During the 10th to 15th minute of refining in the LF furnace, the spraying frequency of spray gun 1 is maintained at once per minute, with a spraying volume of 15 kg per time. During the 25th to 30th minute of refining in the LF furnace, the spraying frequency of spray gun 1 is maintained at once per minute, with a spraying volume of 8 kg per time. During the 35th to 40th minute of refining in the LF furnace, the spraying frequency of spray gun 1 is maintained at once per minute, with a spraying volume of 2 kg per time. During the 40th minute and beyond of the LF furnace, the spraying frequency of spray gun 1 is adjusted to once every three minutes, with a spraying volume of 2 kg per time.

[0036] The entire refining process does not require opening the furnace door to add deoxidizer, and the reducing atmosphere inside the furnace is maintained well. Compared with the traditional furnace door feeding method, the oxygen content of bearing steel in the final slag in this embodiment is reduced to 6.34 ppm.

[0037] Example 2: In this embodiment, the deoxidation operation of medium carbon steel 50 in the LF refining furnace is carried out (the time interval between the two stages is the power supply time).

[0038] During the 10th to 15th minute of refining in the LF furnace, the spraying frequency of spray gun 1 is maintained at once per minute, with a spraying volume of 30 kg per time. During the 25th to 30th minute of refining in the LF furnace, the spraying frequency of spray gun 1 is maintained at once per minute, with a spraying volume of 15 kg per time. During the 35th to 40th minute of refining in the LF furnace, the spraying frequency of spray gun 1 is maintained at once per minute, with a spraying volume of 8 kg per time. During the 40th minute and beyond of the LF furnace, the spraying frequency of spray gun 1 is adjusted to once every three minutes, with a spraying volume of 8 kg per time.

[0039] The entire refining process does not require opening the furnace door to add deoxidizer, and the reducing atmosphere inside the furnace is maintained well. Compared with the traditional furnace door feeding method, the oxygen content of bearing steel in the final slag in this embodiment is reduced to 5.15 ppm.

[0040] Example 3: In this embodiment, high carbon steel GCr15 is subjected to LF refining furnace deoxidation operation (the time interval between the two stages is the power supply time).

[0041] During the 10th to 15th minute of refining in the LF furnace, the spraying frequency of spray gun 1 is maintained at once per minute, with a spraying volume of 50 kg per time. During the 25th to 30th minute of refining in the LF furnace, the spraying frequency of spray gun 1 is maintained at once per minute, with a spraying volume of 20 kg per time. During the 35th to 40th minute of refining in the LF furnace, the spraying frequency of spray gun 1 is maintained at once per minute, with a spraying volume of 10 kg per time. During the 40th minute and beyond of the LF furnace, the spraying frequency of spray gun 1 is adjusted to once every three minutes, with a spraying volume of 10 kg per time.

[0042] The entire refining process does not require opening the furnace door to add deoxidizer, and the reducing atmosphere inside the furnace is maintained well. Compared with the traditional furnace door feeding method, the oxygen content of bearing steel in the final slag in this embodiment is reduced to 4.42 ppm.

[0043] As can be seen from the above description, the embodiments of the present invention achieve the following technical effects: A deoxidation device and method for an LF ladle refining furnace are disclosed. This deoxidation device utilizes a multi-sprayer, inclined design to evenly distribute the deoxidizing material over a larger slag surface, accelerating the slag surface reaction rate. The entire process does not require opening the furnace door, effectively maintaining a reducing atmosphere within the furnace, preventing slag splashing and flue gas dispersion, significantly improving the working environment, reducing safety hazards caused by slag splashing, minimizing material loss due to axial flow fans, and lowering production costs. The deoxidation device employs a control system to achieve precise quantitative and continuous supply of deoxidizing material, reducing human error and resulting in more thorough deoxidation.

[0044] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A deoxidation device for an LF ladle refining furnace, the LF ladle refining furnace comprising a water-cooled furnace cover and a ladle, the water-cooled furnace cover covering the top of the ladle, characterized in that, The deoxygenation device includes a spray gun and a spray tank. The spray gun and the spray can are connected. The blowing tank contains deoxidizing material. The spray gun is mounted on the water-cooled furnace cover. The spray gun can spray the deoxidizing material in the spray tank onto the surface of the molten steel in the ladle.

2. The deoxidation device for an LF ladle refining furnace according to claim 1, characterized in that, The water-cooled furnace cover includes an upper cover and a lower cover. The upper cover is a spherical structure, and the lower cover is a cylindrical structure with openings at both the top and bottom. The upper cover covers the upper end of the lower cover, and the upper cover and the lower cover are an integral structure. A hole is provided on the upper cover, through which the spray gun enters the water-cooled furnace cover.

3. The deoxidation device for an LF ladle refining furnace according to claim 2, characterized in that, The upper cover is provided with three holes, and each hole is equipped with a spray gun; The distance L1 between the center point of the hole and the center point of the upper cover is 50mm~100mm; The three holes are evenly distributed along the circumference of the upper cover.

4. The deoxidation device for an LF ladle refining furnace according to claim 3, characterized in that, Two breathable bricks are provided at the bottom of the ladle, and the projection of one of the three spray guns at the bottom of the ladle is located between the two breathable bricks.

5. The deoxidation device for an LF ladle refining furnace according to claim 1, characterized in that, An electrode is located at the center of the water-cooled furnace cover. The nozzle of the spray gun is tilted towards the electrode. The angle α between the axis of the spray gun and the axis of the ladle is 40°~50°.

6. The deoxidation device for an LF ladle refining furnace according to claim 1, characterized in that, The length L2 of the spray gun entering the inside of the water-cooled furnace cover from the water-cooled furnace cover is 150mm~300mm.

7. The deoxidation device for an LF ladle refining furnace according to claim 1, characterized in that, The spray tank is composed of an upper straight cylindrical section and a lower inverted conical section. The upper end of the straight cylindrical section is the feed inlet, and the lower end of the inverted conical section is the discharge outlet. A valve is provided at the discharge outlet. A mixing box is provided below the spray tank, and the mixing box is connected to the spray tank through the valve. The gas source is connected to the valve through a first gas supply pipeline, and the gas source is also connected to the mixing box through a second gas supply pipeline. The mixing box is connected to the spray gun through a jetting pipeline.

8. The deoxidation device for an LF ladle refining furnace according to claim 1, characterized in that, The spray tank is equipped with a weighing system, which weighs the deoxidizing material entering the spray gun.

9. The deoxidation device for an LF ladle refining furnace according to claim 8, characterized in that, The deoxygenation device also includes a control system, and the spray gun and the weighing system are both connected to the control system.

10. A method for deoxidizing an LF ladle refining furnace using the deoxidation device for an LF ladle refining furnace as described in any one of claims 1 to 9, characterized in that, Includes the following steps: Step 1, preparation stage: add deoxidizing material to the injection tank, and select the corresponding control mode in the control system according to the steel grade being smelted. Step 2: During the 10th to 15th minute of refining in the LF furnace, deoxidizer material is injected intermittently onto the slag surface inside the furnace through a spray gun. The injection frequency is once per minute. When smelting low-carbon steel, the injection amount per injection is 14.3~15.7 kg; when smelting medium-carbon steel, the injection amount per injection is 25.5~34.5 kg; and when smelting high-carbon steel, the injection amount per injection is 43.5~57.5 kg. Step 3: During the 25th to 30th minute of refining in the LF furnace, deoxidizing material is injected. The injection frequency of the spray gun is maintained at once per minute. When smelting low carbon steel, the injection amount per injection is 7.6~8.4Kg; when smelting medium carbon steel, the injection amount per injection is 12.8~17.2Kg; when smelting high carbon steel, the injection amount per injection is 17~23Kg. Step 4: During the 35-40 minute stage of refining in the LF furnace, deoxidizing material is injected. The injection frequency of the spray gun is maintained at once per minute. When smelting low carbon steel, the injection amount per injection is 1.9-2.1 kg; when smelting medium carbon steel, the injection amount per injection is 6.8-9.2 kg; when smelting high carbon steel, the injection amount per injection is 8.5-11.5 kg. Step 5: During the 40-minute or later stage of refining in the LF furnace, deoxidizing material is injected. The injection frequency of the spray gun is adjusted to once every three minutes. When smelting low carbon steel, the injection amount is 1.9~2.1Kg each time; when smelting medium carbon steel, the injection amount is 6.8~9.2Kg each time; when smelting high carbon steel, the injection amount is 8.5~11.5Kg each time, until refining is completed.

Images